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3D printing calcium phosphate ceramics with high osteoinductivity through pore architecture optimization
Yonghao Wu1, Puxin Liu1, Cong Feng1
1National Engineering Research Center for Biomaterials, Med-X Center for Materials, Sichuan University, Chengdu 610064, China; College of Biomedical Engineering, Sichuan University, Chengdu 610064, China.
Optimizing pore architecture in 3D printed calcium phosphate (CaP) ceramics, specifically using a hexagonal close-packed (HCP) structure, significantly enhances osteoinductivity for bone regeneration. This HCP structure shows superior mechanical properties and promotes bone growth in vivo.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Materials Engineering
Background:
- 3D printed calcium phosphate (CaP) ceramics show limited osteoinductivity compared to conventional methods.
- Optimizing pore architecture is critical for enhancing the bone regeneration capabilities of CaP bioceramics.
- Current 3D printing methods require improved strategies to achieve desired osteoinductive properties.
Purpose of the Study:
- To fabricate and evaluate CaP ceramics with optimized pore architectures for enhanced osteoinductivity.
- To investigate the influence of different pore structures (hexagonal close-packed, octahedral, diamond, gyroid) on ceramic properties and biological responses.
- To assess the efficacy of HCP structured CaP ceramics in promoting bone regeneration both in vitro and in vivo.
Main Methods:
- Digital Light Processing (DLP) 3D printing was used to fabricate CaP ceramics with hexagonal close-packed (HCP), octahedral, diamond, and gyroid pore structures.
- Mechanical properties (compression strength, permeability) were evaluated for each structure.
- In vitro studies assessed osteoblast cell responses, including growth rate and gene/protein expression.
- In vivo studies involved intramuscular implantation in canines and repair of femoral condyle defects.
Main Results:
- CaP ceramics with the HCP structure demonstrated superior compression strength and lower permeability compared to other structures.
- In vitro, the HCP structure promoted uniform osteoblast growth and enhanced osteogenic gene and protein expression.
- In vivo canine intramuscular implantation showed significant new bone formation (8.02 ± 1.94%) in the HCP group after 10 weeks.
- The HCP structure also proved effective in repairing critical-sized femoral condyle defects.
Conclusions:
- 3D printed CaP bioceramics with an optimized HCP pore structure exhibit significantly enhanced osteoinductivity.
- The HCP structure offers a promising combination of mechanical integrity and biological activity for bone regeneration applications.
- These findings support the potential of HCP structured CaP ceramics for personalized clinical treatments of bone defects.
